This ^^^I don't like/don't feel as safe when I can't wrap my arms around and having to toss ropes. I'll do it if it's the only option but otherwise no thanks. About volleyball to basketball size is sweet spot. I seek out limbs, love having a few to break up the outline.
I just don't feel as safe in real large trees that I cant grab around and slide down, if needed. For me it's more effort and time on the bigger trees.